It is amazing to see how many materials are around in my house. Materials we coud repurpose. This swap is to recylce any kind of material (chunk board, card board or non-corrugated card stock or any other material). Just look around you and be creative. For my postcard I often usethese boards, but I use the other side of the board. So using the front of the box was a new idea for me. Well, it is a lovely postcard, isn't it?